浅谈注水井防膨效果评价方法

渤海Z油田黏土含量高,水敏性强必须要对储层进行防膨。但目前行业、企业均未对防膨效果评价有明确规定,大量文献也表明目前对防膨效果与评价指标也存在多样性。结合油田近19年实际生产数据分析认为视吸水指法能够较好地体现注水井防膨的实际效果,结合油井端地层压力的变化,综合考虑油水井井况、工作制度,最终能客观评价注水井防膨效果,为油田实施周期性防膨提供依据。

Discussion on Evaluation Method of Anti-swelling Effect of Water Injection Well

The Z oilfield in Bohai Bay has high clay content and strong water sensitivity. It is necessary to prevent reservoir swelling. However, at present, there is no clear regulation on the evaluation of anti-swelling effect in industries and enterprises, and lots of paper also shows that there are diversity of anti-swelling effect and evaluation index. Based on the analysis of actual production data in recent 19 years,it is concluded that the apparent water absorption index can better reflect the actual effect of anti-swelling in water injection wells. Considering the changes of formation pressure, the well condition and working system of oil and water wells, the anti-swelling effect of water injection wells can be evaluated objectively,and the period for anti-swelling in oil fields can be decided.